Method and apparatus for cleaning drainpipes in movable equipment

Abstract

A method for cleaning a plurality of drainpipes installed in a movable equipment by causing a flow of a cleaning solution through the drainpipes includes the steps of connecting provisional pipes to the plurality of drainpipes, feeding a cleaning solution into the provisional pipes and the drainpipes, and applying negative pressure suction force to the provisional pipes and the drainpipes to cause a flow of the cleaning solution in the opposite direction to a drain direction in normal use, to thereby clean the drainpipes.

What is claimed is:  
     
       1. A method for cleaning a plurality of drainpipes installed in movable equipment by causing a flow of a cleaning solution through the drainpipes, the method comprising the steps of: 
       connecting provisional pipes to respective drainpipes;  
       feeding a cleaning solution into the provisional pipes and the drainpipes; and  
       applying negative-pressure suction force to the provisional pipes and the drainpipes to cause a flow of the cleaning solution in the opposite direction to a drain direction in normal use, to thereby clean the drainpipes.  
     
     
       2. The method for cleaning a plurality of drainpipes as recited in  claim 1 , wherein the negative pressure suction force is applied by operating a vacuum pump. 
     
     
       3. The method of cleaning a plurality of drainpipes as recited in  claim 1 , wherein the movable equipment is an airframe of a passenger airplane.